Molecular motion shows itself as

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(A) Molecular motion is directly related to the average kinetic energy of the molecules in a system.According to the kinetic theory of gases,the absol

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Temperature

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(A) Molecular motion is directly related to the average kinetic energy of the molecules in a system.According to the kinetic theory of gases,the absolute temperature $T$ of a gas is proportional to the average translational kinetic energy of its molecules,given by the relation $K_{avg} = \frac{3}{2} k_B T$,where $k_B$ is the Boltzmann constant.Therefore,molecular motion manifests itself as temperature.Internal energy is the sum of both the kinetic energy and the potential energy of the molecules,so it is not solely a measure of molecular motion.

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